CRSS anisotropy and tension/compression asymmetry of a commercial superalloy

被引:58
作者
Nitz, A [1 ]
Lagerpusch, U [1 ]
Nembach, E [1 ]
机构
[1] Univ Munster, Inst Met Forsch, D-48149 Munster, Germany
关键词
D O I
10.1016/S1359-6454(98)00126-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The critical resolved shear stresses (CRSS) of the gamma'-strengthened nickel-based superalloy NIMONIC 105 and of its two constituent phases-disordered f.c.c. gamma-matrix and L1(2)-long-range ordered gamma'-phase-have been measured in tension and compression. The single crystals had the following orientations: [001], [011], [(1) over bar 11], and [(1) over bar 23]; the deformation temperatures T ranged from 283 to 1150 K. The dislocation processes in NIMONIC 105 have been studied by transmission electron microscopy and slip trace analyses. The CRSS tau(o) of single-phase gamma'-crystals showed the abnormalities which have been observed for many other L1(2)-long-range ordered materials: (i) positive slope a partial derivative tau(o)/partial derivative T, (ii) anisolropy; (iii) tension/compression (t/c) asymmetry, tau(o) of two-phase NIMONIC 105 has anisotropies and (t/c) asymmetries which are similar to those of single-phase gamma', but they are less pronounced, tau(o) of NIMONIC 105 is, however, nearly independent of T for 400 K less than or equal to T less than or equal to 1000 K. Copley and Kear's dynamic model (Trans. Am. Inst. Min. Engrs, 1967, 239, 984) has been adapted to relate tau(o) of two-phase NIMONIC 105 to tau(o) of its constituent single-phase gamma'- and gamma'-phase. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
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页码:4769 / 4779
页数:11
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